[moved from Programming to Chat] Before Henry gets carried away by poetry perhaps we should reveal that, however noble the quote may look at first sight, the dream in the poem concerns the subject killing his wife (but he doesn't).
hth :-) Ben On Thu, 18 Nov 2021 at 03:56, R.E. Boss <[email protected]> wrote: > I am a simple user, you are not only the architect, but also the > implementor. > Most of all I consider J as a mathematical tool, that's the way I use it > anyhow, and in mathematics I would immediately define u&.(w`v) as I did. > What's more, I would extend &, &: en &:. accordingly. > Just to have a complete and (IMO) elegant language. > > But, as a Dutch poet once wrote (and google translated): "but between > dream and deed, laws stand in the way, and practical objections." > After all, there is a workaround. > > > R.E. Boss > > > -----Original Message----- > From: Programming <[email protected]> On Behalf Of > Henry Rich > Sent: woensdag 17 november 2021 16:35 > To: [email protected] > Subject: Re: [Jprogramming] x u&.(w`v) y > > Here's an argument against: > > The dual [x] u&.v y says 'apply u, but with a different point of view. > First transform [x and] y, then apply u, then transform the result back to > the original point of view.' > > The semidual x u&(a:`v) y says 'u&.v, but the point-of-view business > applies only to y'. x goes through unchanged. > > What you propose puts x and y in different spaces to begin with; > presumably w and v transform them to a common point of view, but then the > result is transformed back by applying BOTH inverses. I don't see an > application for this, or an easy verbal description of it. > > Henry Rich > > On 11/17/2021 10:18 AM, R.E. Boss wrote: > > *&.(>:`<:)/ i.2 3 > > |domain error > > | * &.(>:`<:)/i.2 3 > > > > *&.(a:`<:)/ i.2 3 > > 1 4 9 > > *&.(a:`<:)&.(>:`a:)/ i.2 3 > > 2 6 12 > > > > so why not define > > x u&.(w`v) y > > as > > x u&.(w`a:)&.(a:`v) y > > ? > > > > > > R.E. Boss > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
